Improvement in casting die-plates



J. B. McC'UNE.

CASTING DIE-PLATES.

N0.131,1-94. Patented Aug.16, 1876.

N.PE TERS. PHDTGUTHOGRAPHER, WAEHINGTON. D. C. v

iivrrnn STATEs ATENT Demo-E.

lMPROV EMENT lN CASTiNG DIE-PLATES.

Specification forming part of Letters Patent No. 181,194., dated August15, 1876; application filed July 13, I876.

1'0 all whom it may concern:

Be it known that I, JOSEPH B. MOCUNE, of Hamilton, in the county ofWentworth, Canada, have invented certain new and useful Improvements inthe Construction of Dies and Die-Plates for Forming Molds for Gastings,of which the following is a specification:

This invention relates to certain improvements in the construction ofpatterns and pattern-plates for the formation of molds for metalliccastings, and is designed to enable such molds to be made rapidly bymachinery, being especially intended to be. employed in connection withthe apparatus for which Letters Patent of the United States were grantedto me on the llth day of January, 1876, No. 172,044, in which suchpattern-plates are used in the process of casting by stamping the moldin the sand.

The ordinary method of forming molds in sand and other material formetallic castings by hand has been found a tedious and expensiveprocess, requiring the services of a skilled mechanic. Attempts havebeen made, by the employment of metallic dies, to simplify the method offorming such molds, and enable the same to be constructed rapidly bymachinery. To this end metallic pattern-plates have been used inconnection with the ordinary patterns, such plates being constructed ofsheet metal stamped into proper shape to fit around the patterns. Suchplates have necessarily to be very accurately constructed,

in order that both the pattern and bed may,

be removed from one side of the plate, which has rendered theconstruction of such plates from stamped metal very difficult, if notwholly impracticable, as well as extremely expensive. The principalobject of my invention, therefore, is to overcome said objections byforming said pattern-plate from the pattern itself by first form'rng apattern-bed, then casting suitable metal directly around and in contactwith the patternbed, whereby the greatest accuracy is attained, and thepatternplate is constructed at comparatively little expense. In thedrawing, Figure 1 represents a plan v View of the pattern.pattern-plate, and its supporting-frame. Fig. 2 represents a sectionalview of the same, showing the patternbed also; and Fig. 3, a detachedview of the pattern and pattern-bed.

first prepare a half-flask with molding-sand in the same manner as foran ordinary mold, after which I embed the pattern therein, facedownward, and tamp the sand around the same, as-usual, and afterwardwork it ofi' carefully around the line of parting. I then cover thesurface with parting-sand, after which I place upon the halt flaskanother half-flask, and fill in and tainp with sand, forming the twosides of the mold. So far the operation is precisely the same followedin the preparation of the ordinary sand molds. The two'half-fiasks arethen separated, the pattern beiu gallowed to remain inthefirst-mentioned half-flask. To the top of said half-flask is thensecured a section of a flask, or a frame similar to the supporting.-

frame, of aheight corresponding to the thick; ness of the pattern-bed'tobe formed,and sand is filled in and built up carefully around the edgesof the pattern to a height corresponding with the thickness desired inthe pattern,- bed. The last-mentioned half-flask .is then secured uponthe section, proper gates or channels having previously been made in thesand, and the metal poured in, filling thev space between the patternand the mold formed upon the sand in the sections and the upper orlast-tamped half-flask, and forming the desired pattern-bed, the edgesof which may be afterward dressed off to remove any irregularities or,instead of forming the counterpart in the lasttamped half-flask, afterthe pattern is embedded in the first, the section may be attached to thefirst half-flask with the pattern embedded in the sand therein, andadditional sand filled in and built around the pattern. The secondhalf-flask may be then secured, and after dusting the surface of thesand and pattern with parting-sand, the counterpart may be formed, asbefore mentioned.

The part of the mold-core formed in the lastmentioned half of the flaskmay then be 2 lSl,l94

worked roughly OK, so as to leave a proper space between it and thepattern when the parts of the flask are again placed together,

and the metal is again cast in, as before; or I fill the first-mentionedhalf-flask with sand, and em bed the pattern therein face downward, andthen carefully work ofl the sand along the parting-line or upper edgesof the pattern.

After this is done I dust the whole surface with partingsa'nd, and thensecure the other sand, and sink the pattern farther therein to a depthcorresponding to the thickness of the pattern-bed to be formed. This maybe done by gently rapping the pattern into the sand, being careful topreserve the contour of the edges of the sand, or by pressing thepattern firmly into the sand. The two parts of the flask are thensecured together, the gates or channels being previously formed in theordinary manner. It will be perceived that the last-mentioned part ofthe flask will contain the sand and face of the pattern-bed, the metal,on being poured in, occupying the space between said face and thereverse side of the pattern embedded in the first-mentioned part of themold. The pattern-bed thus formed, when removed, is trimmed 011', ifnecessary, and is ready to be used in the formation of thepattern-plate, as hereinafter described.

From the pattern A and pattern-bed B, thus constructed, thepattern-plate U is formed as follows: A half-flask is filled with sand,as usual, which is struck off. The frame D is then embedded in the sanduntil its upper edges are flush with the surface of the same, afterwhich the pattern A and pattern-bed B are embedded in the sand withinthe frame D, the pattern uppermost. The sand is then carefully workedoff along the parting-lineor the lower edge of the pattern, after whichanother halt flask is secured to the first, and a counterpart of thesand, and embedded pattern in the same, is formed in said secondhalfflask in the usual manner. The parts of the flask are thenseparated, and the sand is carefully worked off below the parting-lineof the pattern, along the edges of the pattern-bed, in a line as nearlyparallel with the parting'lilie or lower edge of the pattern aspossible, and at a sufficient distance therefrom to give the desiredthickness to the pattern-bed when finished. The surrounding portions ofthe surface of the sand within-the frame are also removed to a depthcorresponding to the thickness of the pattern-plate O, to be formed,after which the two parts of the flask are properly secured together forcasting, which is done in the ordinary manner, the metal filling in' thespace formerly occupied by the sand, which has been removed from withinthe frame, forming the pattern-plate 0 around the pattern A and its bedB.

It is evident from the above description that the pattern and pattern-bed i may be constructed and used in one piece, when desired, beingformed-in such case by removing the pattern from the mold after the moldforthe bed has been formed, and before casting, as will readily beunderstood by any founder.

' I have described my invention as applied to the formation of molds forstovelegs, in which the pattern draws from only one side; but it isevident that it may be applied to the construction of molds forstove-plates, car-wheels, car-boxes, sewingmachines, and all othercastings, whether drawing from one or two sidesin the latter instancetwo beds and pattern-plates being formed, one for each side of the mold.

It is obvious that other methods of forming the pattern-plates bycasting the metal around the patterns may be employed, such as wouldnaturally be'suggested to any one familiar with the casting and foundingof metals and henceI do not confine myself to the precise details ashereinbefore set forth.

' What I claim, and desire to secure by Letters Patent, isy The process,herein described, of forming pattern-plates from the pattern itself byfirst forming a pattern-bed and casting metal directly around and incontact with the same, substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand inthe presence of the subscribing witnesses.

JOSEPH B. MGGUNE. Witnesses:

JAMES L. NoRRIs, CHAS. L. GooMBs.

